**Rule**: **Stative Verbs**. The verb 'belong' indicates possession or a state of being a member of something. It is a stative verb and is not used in continuous tenses. **Correct Usage**: 'belongs' correctly states the permanent fact of ownership. The subject 'That building' is singular. **Incorrect Options**: (a) 'is belonging' is grammatically incorrect. (c) 'has belonged' could be used with 'since' or 'for' to show duration, but simple present is better for a simple statement of fact. (d) 'belong' is a plural verb.

**Rule**: The **Present Perfect Continuous Tense** is used to talk about an ongoing, long-term project or intention that has been in progress for a period of time ('for a while now'). **Correct Usage**: 'has been planning' correctly conveys the continuous nature of this strategic thinking over a period that leads up to the present. **Incorrect Options**: (a) 'plans' (Simple Present) is a general habit. (b) 'is planning' (Present Continuous) doesn't incorporate the duration from the past. (d) 'planned' (Simple Past) is a completed action.

**Rule**: The **Present Continuous Tense** used with 'always' expresses annoyance or criticism about a frequently repeated, irritating habit. The structure is **am/is/are + always + verb-ing**. **Correct Usage**: 'is always leaving' conveys the speaker's frustration with the sister's repetitive and annoying habit. **Incorrect Options**: (b) 'does, leave' is an incorrect structure. (c) 'has, left' (Present Perfect) refers to a completed action. (d) 'leaves' (Simple Present) would state the habit neutrally without the added emotion of annoyance.

**Rule**: The **Simple Present Tense** is used to state a fact that is currently true. 'Meet' in this context means 'to satisfy or fulfill'. **Correct Usage**: 'meets' correctly states the current fact that she satisfies all the requirements. 'Has met' would also be correct, emphasizing the completion of fulfilling the requirements. **Incorrect Options**: (a) 'is meeting' (Present Continuous) is less common for this meaning. (b) 'has met' (Present Perfect) is also a very strong correct answer. (d) 'meet' is a plural verb.

**Rule**: **Stative Verbs**. When 'see' means 'understand', it is a stative verb and is not used in the continuous form. It's used in the **Simple Present Tense**. **Correct Usage**: 'I see what you mean' is a common idiom for 'I understand what you mean'. **Incorrect Options**: (b) 'am seeing' is used for the physical act of looking at something or for dating someone. (c) 'have seen' refers to past visual experience. (d) 'sees' is for a third-person singular subject.

**Rule**: The **Simple Present Tense** is used to state a general truth or a permanent fact. **Correct Usage**: 'provides' correctly states a nutritional fact. The subject 'A balanced diet' is singular. **Incorrect Options**: (a) 'is providing' (Present Continuous) is for a temporary action. (b) 'has provided' (Present Perfect) is the wrong tense. (d) 'provide' is a plural verb.

**Rule**: The **Present Perfect Tense** can be used to describe a state or situation that has been true for a long period and is still true today. A collective noun like 'family' can be treated as singular. **Correct Usage**: 'has come' indicates a lineage or origin that has continued over a long time ('for generations') and is still the case. **Incorrect Options**: (a) 'comes' (Simple Present) is also possible but 'has come' better emphasizes the long history. (b) 'is coming' (Present Continuous) is for an action in progress. (d) 'come' would be used if 'family' were treated as a plural noun (the members).

**Rule**: The **Present Perfect Continuous Tense** is used to emphasize the duration of a temporary action that started in the past and continues up to the present. **Correct Usage**: The phrase 'for the last six months' highlights the duration of the ongoing, temporary job. 'has been working' is the best choice to emphasize this continuous period of work. **Incorrect Options**: (a) 'works' (Simple Present) implies a permanent job. (b) 'is working' (Present Continuous) focuses only on the present. (d) 'has worked' (Present Perfect) focuses more on the achievement rather than the ongoing duration.

**Rule**: The **Simple Present Tense** is used for scientific facts and universal truths. **Correct Usage**: The rotation of the Earth is a permanent astronomical fact. The subject 'The Earth' is singular, so the verb is 'rotates'. **Incorrect Options**: (b) 'is rotating' (Present Continuous) is for a temporary action. (c) 'has rotated' (Present Perfect) is the wrong tense. (d) 'rotate' is a plural verb.

**Rule**: **Stative Verbs**. 'Contain' is a stative verb describing a state of inclusion. It is not used in continuous tenses. The **Simple Present Tense** is used for scientific facts. **Correct Usage**: 'contains' correctly states a permanent biological fact. The subject 'The human body' is singular. **Incorrect Options**: (a) 'is containing' is grammatically incorrect. (c) 'has contained' is the wrong tense. (d) 'contain' is a plural verb.